Agenda 5/16
description
Transcript of Agenda 5/16
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Agenda 5/16
• Crayfish Intro PowerPoint
• Crawdad Hole Song
• Dissections: External Anatomy
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Crayfish
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Dirty Jobs: Crawdads
http://www.discovery.com/tv-shows/dirty-jobs/videos/crawfish-catcher.htm
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I. External Features
A. Two segments:1. Cephalothorax:
a. Fused head and thoraxb. 13 segments covered by a hard
carapace 2. Abdomen:
a. 7 segments
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Abdomen
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Cephalothorax
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Carapace (Cephalothorax)
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I. External Features Cont.
C. Head1. Most anterior region
a. Antennae, antennules, eyes, and mouthparts
D. Thorax1. Posterior to the head
a. walking legs and chelipeds attached
b. Contains heart, liver, and gills
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External View (Dorsal)
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External View (Ventral)
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Antennae
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Antennule
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Eye
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II. Movement
A. Walking Legs1. Flexion, extension, and rotation
B. Swimmerets1. Creates currents to bring O2 to gills
C. Uropods1. Act as paddle for rapid movement
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Walking Leg
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Swimmeret
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Uropod
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II. Movement Cont.
A. Telson1. Between uropods, houses anuses
2. Further aids in rapid movement
B. Chelipeds1. Self defense
2. Grab and manipulate food
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Cheliped
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Telson
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Agenda 5/19
• PowerPoint: Crayfish
• Video: Crayfish Dissection
• Dissection: external #16-18
Internal # 1-13
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III. Digestive System
A. Mouth1. Food enters after broken down by structures
B. Mandibles1. Bite and crush food
C. 1st/2nd maxillae1. Move food to throw into mouth
D. Maxillipeds1. Food manipulation
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Mandible
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Maxilla
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Maxillaped
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III. Digestive System Cont. A. Esophagus
1. Carries food from mouth to stomach
B. Cardiac stomach1. Stores and chews food
C. Liver (digestive gland)1. Makes digestive enzymes
2. Completes digestion and absorbs nutrients
D. Intestine1. Carries solid waste to anus
E. Anus
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Digestive Gland (Dorsal)
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Digestive Gland (Lateral)
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Esophagus
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Intestine
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Stomach
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IV. Circulatory System
A. Heart1. Pumps blood
B. Dorsal abdominal artery1. Carries blood from heart to abdomen
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Heart
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V. Respiratory System
A. Gills1. Used for getting O2 from water
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Gill
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VI. Excretory System
A. Green Gland1. Filters liquid waste from blood
2. Like a primitive kidney
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Green Gland
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VII. Nervous System
A. Brain1. Coordinates senses and nerve messages
B. Ventral Nerve Cord1. Carries nerve impulses
C. Eyes1. Focus light
D. Antenna/antennules 1. Used for touch, taste, smell, and balance
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Ventral Nerve Cord
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Ventral Nerve Chord Posterior
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Eggs
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Female
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Male
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Gonad
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Crayfish birth
Note* Swimmerets hold larva
•http://www.watchknowlearn.org/Video.aspx?VideoID=39090&CategoryID=13835
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Dissection
• https://www.youtube.com/watch?v=W7F0jZgdc8A
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Crawdad song
https://www.youtube.com/watch?v=23u8CeiN9OY
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• http://www.gvsd.org/Page/1738
• http://www.watchknowlearn.org/Video.aspx?VideoID=43138&CategoryID=13835